Questions: Which molecules have the strongest intermolecular forces? BF3 H2S NH3 H2

Solution Steps

To determine which molecule has the strongest intermolecular forces, we need to identify the types of intermolecular forces present in each molecule:

• BF$_3$: Boron trifluoride is a nonpolar molecule. The primary intermolecular force is London dispersion forces.
• H$_2$S: Hydrogen sulfide is a polar molecule. It exhibits dipole-dipole interactions and London dispersion forces.
• NH$_3$: Ammonia is a polar molecule and can form hydrogen bonds due to the presence of nitrogen bonded to hydrogen. It also has dipole-dipole interactions and London dispersion forces.
• H$_2$: Hydrogen is a nonpolar molecule. The primary intermolecular force is London dispersion forces.

The strength of intermolecular forces can be ranked as follows:

1. Hydrogen bonding (strongest)
2. Dipole-dipole interactions
3. London dispersion forces (weakest)

Among the given molecules, NH$_3$ (ammonia) is the only one capable of hydrogen bonding, which is the strongest type of intermolecular force. Therefore, NH$_3$ has the strongest intermolecular forces among the listed molecules.

Final Answer